Welder Red Seal · Question
Which of the following gases is typically used as a shielding gas or plasma gas for cutting carbon steel with a plasma arc cutting system to achieve good cut quality and electrode life?
For plasma cutting carbon steel, oxygen is the preferred plasma gas. It reacts chemically with the steel, generating additional heat through an exothermic react
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Question: Which of the following gases is typically used as a shielding gas or plasma gas for cutting carbon steel with a plasma arc cutting system to achieve good cut quality and electrode life?
Answer options:
- Argon-Hydrogen (Ar-H2) ✅ Oxygen (O2)
- Nitrogen (N2)
- Argon (Ar)
Correct answer: Oxygen (O2)
Explanation: For plasma cutting carbon steel, oxygen is the preferred plasma gas. It reacts chemically with the steel, generating additional heat through an exothermic reaction, which results in faster cutting speeds and cleaner cuts.
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